极端干旱气候下盐化草甸植被净初级生产力对全球变化的响应

利用作者建立的塔里木盆地北部盐化草甸植被净初级生产力模型 ,模拟了极端干旱气候下盐化草甸植被净初级生产力对全球变化的响应。结果表明 ,在一定土壤质地条件下 ,盐化草甸植被净初级生产力随地下水埋深的增加而逐渐下降。地下水埋深越大 ,盐化草甸植被净初级生产力对地下水埋深变化的响应越敏感。全球变化造成的温度升高对盐化草甸植被净初级生产力的影响 ,也是依地下水埋深的不同而有所差异。地下水埋深较小时,盐化草甸植被净初级生产力对温度升高的反应较小 ;随着地下水埋深的加大,其响应程度明显增加。因而 ,地下水埋深越大 ,盐化草甸植被净初级生产力对全球变化的响应就越明显。

Responses of NPP of salinized meadow in hyper-arid area to global change

Responses of NPP of salinized meadow in hyper arid area to global change were predicted using the NPP model,developed by the author to simulate the NPP of natural salinized meadow in northern part of Tarim Basin.The result shows that the NPP of salinized meadow in hyper arid area is the function of underground water table(UWT) and the temperature in given soil conditions.The NPP of salinized meadow decreased with increase of underground water table.Responses of NPP to change of UWT and temperature increase resulting from global change vary with different UWT of salinized meadow in hyper arid area.The impacts of global change to NPP of salinized meadow,therefore,depend on differing UWT of salinized meadow.It is extrapolated that responses of NPP of salinized meadow to global change are more sensitive with greater UWT than those with shallower UWT.